[Cherry-pick] DYN-9377: Update libg

[github-actions]

Cherry-pick of #16632 to RC4.0.0_master

Purpose

Update LibG.

This version of LibG contains:

• LibG targeting .NET standard 2.1 (update from 2.0)
• Geometry performance improvements to ClosestPointTo and DistanceTo methods for Curves, Surfaces, and PolyCurves

Declarations

Check these if you believe they are true

• Is documented according to the standards
• The level of testing this PR includes is appropriate
• Changes to the API follow Semantic Versioning and are documented in the API Changes document.

Release Notes

• LibG targeting .NET standard 2.1 (update from 2.0)
• Geometry performance improvements to ClosestPointTo and DistanceTo methods for Curves, Surfaces, and PolyCurves

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